What is the primary characteristic of Direct Current (DC)?

The primary characteristic of Direct Current (DC) is that it is constant and flows in one direction. This means that the electric charge (or current) moves steadily in a single, unidirectional flow, which allows for consistent voltage levels over time. This unidirectional flow is what distinguishes DC from Alternating Current (AC), which periodically reverses direction.

In practical applications, DC is commonly used in battery-powered devices, electronics, and motors, where a steady voltage supply is essential for proper operation. This characteristic of constant voltage and direction is crucial in ensuring the reliable performance of electrical equipment. Understanding DC is important for anyone working with electrical systems, as it is foundational to circuit design and analysis.